You need a mutable variable, such as an atom:
user> (defn prop [x]
(let [a (atom x)]
(fn
([] @a)
([x] (reset! a x)))))
#'user/prop
user> (def p (prop 5))
#'user/p
user> (p)
5
user> (p 6)
6
user> (p)
6
user>
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